Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50a30977745dd48…

MALICIOUS

PDF

44.5 KB Created: 2020-07-16 20:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20e4b1ef28b560b5abd6d2169582775d SHA-1: b000e851ef71cf1b580062de1eae2ef607ea8501 SHA-256: c50a30977745dd48d1e03d2a519fe744e5d29515fdd7e3436f7fad3aedc429ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, appears to contain metadata related to book titles and the wkhtmltopdf application, suggesting a potential SEO poisoning or phishing lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=jacques%20mathematics%20for%20economics%20and%20business%208th%20edition%20pdf
    • http://files.vomhiddencreek.com/uploads/1/3/1/6/131606127/kukuko.pdf
    • http://files.stjohnsatlanta.org/uploads/1/3/1/8/131856569/bawudazog_damisamun_domametid.pdf
    • http://files.thesouthmillschurch.com/uploads/1/3/1/8/131857193/pexokomu_gegigo.pdf
    • http://files.exquisitebridalcollection.com/uploads/1/3/2/8/132814439/xujezonotulekezigub.pdf
    • http://files.maggieleighmedia.com/uploads/1/3/1/4/131437983/batepimirudupe_xosifipo_rudejopaxow_livuzipawuki.pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdf
    • http://files.madebyloulou.net/uploads/1/3/1/8/131871891/59bfb6ba928ffb6.pdf
    • http://files.shcsublimation.com/uploads/1/3/1/4/131437822/576f6f77377.pdf
    • http://files.mexicollextric.com/uploads/1/3/0/7/130775505/suvijawojubizixuji.pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b
    • https://toguzafozar975898281.files.wordpress.com/2020/06/31526602458.pdf
    • https://zidimamokad339045790.files.wordpress.com/2020/06/lesaropekavisefatulazud.pdf
    • https://bagesamajar.files.wordpress.com/2020/07/nidivuwamegiri.pdf
    • https://tuzidel.files.wordpress.com/2020/06/doketomomolalexawes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0434/0577/0904/files/61837349237.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/saran.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/sewote.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/54105271332.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/38239536644.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/173120969.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d55.bin
d038b548cd1e06f449b94e7d5ce832b28b316a67317485b6570c50a78eb5ebae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D55 5692 bytes
font_01_sfnt_off00008081.bin
c9c4e23ff348427aad444809b88adb9c0bbcbca7cb312b5efabecc2aede4b0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8081 10384 bytes

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